Krysztof - Are you using build time enhancement or are you using the dynamic enhancement agent? If you don't know the answer to this question, you are probably using the dynamic agent. If that is the case, I'd recommend trying to setup your build to use build time enhancement(Let me know if you want some links). If you're already doing build time enhancement, please set the property openjpa.DynamicEnhancementAgent=false. Also, set openjpa.RuntimeUnenhancedClasses=unsupported.
I've found in my test environment that from time to time the Sun javaagent fails for no apparent reason. Thanks, Rick
